Home / 128,815.20-193,132.80-76,197.60

Finding the Fourth Proportional to 128,815.20, 193,132.80 and 76,197.60

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Solution

The fourth proportional to 128,815.20, 193,132.80 and 76,197.60 is: 114,243.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,815.20 : 193,132.80 = 76,197.60 : x
  2. Step 2: Convert to fraction form
    128,815.20/193,132.80 = 76,197.60/x
  3. Step 3: Cross multiply
    128,815.20x = 193,132.80 × 76,197.60
  4. Step 4: Simplify right side
    128,815.20x = 14,716,255,841.28
  5. Step 5: Solve for x
    x = 14,716,255,841.28/128,815.20
  6. Step 6: Final answer
    x = 114,243.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.